<template>
	<view>
        <!-- 自定义搜索组件 -->
        <!-- <my-search :bgcolor="'#8ff'" :radius="3"></my-search> -->
        <my-search @click="gotoSearch"></my-search>
            
		<view class="scroll-view-container">
		    <!-- 左侧滑动区域 -->
            <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
                <block v-for="(item,index) in cateList" :key="index">
                    <view @click="activeChange(index)" :class="['left-scroll-view-item',index === active ? 'active' : '']">{{item.cat_name}}</view>
                </block>    
            </scroll-view>
            
            <!-- 右侧滑动区域 -->
            <scroll-view :scroll-top="scrollTop" class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
                <view class="cate-lv2" v-for="(item2,index2) in cateLive2" :key="index2">
                    <!-- 二级分类标题 -->
                    <view class="cate-lv2-item">/ {{item2.cat_name}} /</view>
                    
                    <!-- 当前二级分类下的三级分类列表 -->
                    <view class="cate-lv3-list">
                        <!-- 三级分类的item项 -->
                        <view @click="gotoGoodsList(item3)" class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3">
                            <!-- 三级分类的图片 -->
                            <image :src="item3.cat_icon"></image>
                            <!-- 三级分类文本 -->
                            <text>{{item3.cat_name}}</text>
                        </view>
                    </view>
                </view>
            </scroll-view>
		</view>
	</view>
</template>

<script>
    import badgeMix from '@/mixins/tabbar-badge.js'
    
	export default {
        mixins: [badgeMix],
        
		data() {
			return {
				wh: 0, //当前设备可用高度
                cateList: [], //左侧列表数据
                active: 0, //激活项
                cateLive2: [], //二级分类数据
                scrollTop: 0, //页面滚动距离
			};
		},
        methods:{
            // 获取左侧列表数据方法
           async getCateList() {
                try{
                    const {data:res} = await uni.$http.get('/api/public/v1/categories')
                    this.cateList = res.message
                     
                    // 为二级分类赋值
                    this.cateLive2 = res.message[this.active].children
                }catch(e){
                    console.log(e)
                    uni.$showMsg()
                }
            },
            
            // 修改激活项索引值函数
            activeChange(index) {
                this.active = index
                this.cateLive2 = this.cateList[index].children
                this.scrollTop = Math.random()
            },
            
            // 三级分类跳转事件,跳转到三级商品页面
            gotoGoodsList(item3) {
                uni.navigateTo({
                    url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
                })
            },
            
            gotoSearch() {
                uni.navigateTo({
                    url: '/subpkg/search/search'
                })
            }
        },
        // 页面加载生命周期函数
        onLoad() {
            const sysInfo = uni.getSystemInfoSync()
            this.wh = sysInfo.windowHeight - 50
            this.getCateList()
        }
	}
</script>

<style lang="scss">
    .scroll-view-container {
        display: flex;
        
        .left-scroll-view {
            width: 120px;
        }
        
        .left-scroll-view-item {
            background-color: #f7f7f7;
            line-height: 60px;
            text-align: center;
            font-size: 12px;
            
            &.active {
                background-color: #fff;
                position: relative;
                
                &::before {
                    content: ' ';
                    display: block;
                    width: 3px;
                    height: 30px;
                    background-color: #C00000;
                    position: absolute;
                    top: 50%;
                    left: 0;
                    transform: translateY(-50%);
                }
            }
        }
    }
    
    .cate-lv2 {
        font-size: 12px;
        font-weight: 700;
        text-align: center;
        padding: 15px 0;
    }
    
    // 三级分类区域
    .cate-lv3-list {
        display: flex;
        flex-wrap: wrap;
        .cate-lv3-item {
            width: 33.33%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            margin-bottom: 10px;
            image {
                width: 60px;
                height: 60px;
            }
            text {
                font-size: 12px;
            }
        }
    }
</style>
